Drilling apparatus for shells



April 6, 1926. 1,579,896

. .H. A. STILLWELL Q DRILLING AYPARATpS F OR SHELLS Filed July 24, 1916 I 11 l ,/za

Z5 Ci anve wfoz M GM 331 6 attozwux Patented Apr. 6, 1926.

UNITED STATES PATENT OFFICE.

HOWARD A. STILLWELL, OI WOODBUBY, NEW JERSEY, ASSIGNOR 1'0 I. DU FONT DE NEMOUBS AND COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION 01 DEL- AWARE.

DRILLING urns-mus ron snnnns.

Application filed July 24, 1916. Serial No. 110,888.

To aZZ whom it may conce m."

Be it known that I, HOWARD A. STILL- WELL, a citizen of the United Statesan'd a ment in Drilling Apparatus for Shells, and- .do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates particularly toian apparatus designed for, drilling holes 111- the explosive charges contamed. 1n shells, so that primers or other charges may be inserted in. said holes, although my invention is ada ted to drilling for other purposes.

Tide-object of my invention is to provide an apparatus, by means of which holes of the above character may be readily drilled, and in such a manner that the bormgs fall away by gravity.- A further ob ect of my invention 1s to provide an apparatus of this character which is simple in construction,

' and which operates so as to feed the shell automatically to the drill while the shell is being rotated.

While my invention 1s capable of embody ment in many different forms, for the purose of illustration I have shown only one orm thereof in the accompanying drawmgs, in which,

Fig. l is a side elevation of an apparatus made in accordance with m invention; and

Fig. 2 is a vertical section of the shellholding means in the same.

In the drawings I have shown a base 1, having thereon an upright 2 provided with a flange 3 in such a manner that said flange extends to either side of the upright 2. Sliding on said u right 2 there is a bracket 4 adapted to be eld in place by a cam 5, operated by a handle 6. Stud bracket carries in its end a stationary drill 7 having projecting from the side thereof a'cutter .8

for producing a counter-sink in the shell. A gauge 9 attached to the bracket 4 determines the depth of the hole to be bored I in the shell. At the rear of the upright 2, there is a shaft 10, having a driving pulley 11 thereon driven from any suitable source of power, said drivin pulley being connected to a pulley 12 or driving a belt 13 adapted to be moved over the same. A loose pulley 14.is also located. on the shaft 10 to I receive the belt 13 when the ap aratus is thrown out of operation. Sal belt 13 passes over two idler pulleys 14. carried on a bracket 15 at the top of the upright 2, and thence around a ulley 16, which 1s splined to a slide 17 passmg through the upper end of the bracket 15. Said slide 17 alsocpasses throu h a lower bracket 18 extending laterally rom the upright 2. The slide 17 is provided with a sleeve 18. carrying a rack 19 which engages with a pinion 20 carriedby a hand-wheel 21 journaled in the lower bracket 18. Collars21 and 21 retain the sleeve 18 in place'onthe slide 17.- On the lower end of the slide 17 there is fixed a collar 22, to which there is screw-threaded a cylinder 23. The collar 22 has a ta ered recess 22 for positioning the base o a shell. On the lower end of the cylinder 23 there is screw-threaded a cap 24 having a ta ered opemn tapere endof a shell 26, which is arranged to be clamped in place by the same. In'the operation of my invention when a shell is to be inserted in the drilling apparatus, it being assumed that the belt 13 is located over the loose pulley 14, the handwheel 21 is operated to elevate the slide 17. The bracket 4 is also lowered by the operation of the handle 6. The ca 24 is removed and a shell is inserted in the cylinder 23, after which the cap 24 is screwedover the end of the cylinder 23 so as to hold the-shell 26 in lace. Said shell 26 is accurately positione in the middle of the cylinder 23'by reason of the ta ered recess 22 receiving the base of the shel and a ta ered opening 25 engaging with the nose 0? the shell. The bracket 4 is'then elevated until the end of the drill 7 is near the end of the shell 26. The belt 13 is now moved onto the driving pulley 12, and the hand-wheel 21 released so as to. permit the shell and the parts carrying the same to be fed by gravity against 25 for engagement with t-he ower- While I have described my invention above in detail, I wishit to be understood that many changes may be made therein without departing from the spirit of my invention, as defined in the following claims.

1. A drilling apparatus for shells, comprising means to feed a shell downwardly in an inverted position, while rotating the shell, and a stationary drill co-operating with the same.

2. A drilling apparatus for shells, comprising means to feed a shell downwardly y gravity in an inverted position, while rotating the shell, and a stationary drill c0- operating with the same.

3. A drilling apparatus for shells, comprising means to feed a shell downwardly in an inverted position, While rotating the shell, a drill co-operating with the same, and a support for said drill vertically adjustable toward and away from said shell feeding means.

i. A drilling apparatus for shells, comprising means to feed a shell downwardly by gravity in an inverted position, while rotating the shall, a drill co-op'erating with the same, and a support for said drill vertically adjustable toward and away from said shell feeding means.

5. In it ork holding member comprising an open ended cylinder adapted to contain'a shell, and an annular cap for said cylinder adapted to support a shell therein.

3. In a device of the class described, a work holding member comprising an open (nded inverted cylinder adapted to contain a shell, said cylinder having a centering incline adjacent the base thereof, and an annudevice of the class described, a'

aforesaid.

8. Boring apparatus for recessing a tubular member tapered at the forward end and comprising a boring tool, means for permitting relative reciprocation along a fixed path her with respect to the path of reciprocation between the boring tool and the tubular member, a support for the tubular member and a tubular stop for positioning the tubular member with respect to the path of reciprocation aforesaid, the tubular stop having a tapered internal bore adapted to fit the tapered end of the tubular member.

9. Boring apparatus for recessing a tubular member tapered at the forward end and corn-s prising a boring tool, means for permitting relative reciprocation along fixed path between the boring tool and the tubular member, a support for the tubular member and a tubular stop for positioning the tubular member with respect to the path of reciprocation aforesaid, the tubular stop having a tapered internal bore adapted. to fit the tapered end of the tubular member, andhaving a threaded connection with the said support.

have hereunto set my hand.

In testimony that I claim the foregoing I I 

